Martin Leuthauser from The Walkmen, for sure. He has some real power, but he can be really fragile as well. Sometimes he tries a bit too hard, but when you hear songs like "Another One Goes By", that tired, drunken howl really hits you in the gut.
I know I'm probably alone in this, but I think Isaac Brock is a great singer. What I love about him is that he has some character, and everything he spouts out in that nasally southern drawl sound like gospel in my ears, and a lot of what he says would sound pretentious if sung by most other people. A lot, and I mean A LOT of people hate his voice, but I find it fascinating. It's so raw, and has much more meaning and impact than a good number of technically skilled/accomplished singers.
I also think Mark Paffi from Bear Vs Shark has an amazing voice. I think he's the best screamer out there, mainly because it's the only screaming that I really love. When he yells, he has impact, and it doesn't get annoying (besides "Heard Iron Bug...", but let's just forget about that). Also, his "pretty" voice is nice (flawed and raw, just how I like it).
Yeah, I like wierd voices. But I still love most of the people mentioned.